By James R. Chiles
From reworking the methods of struggle to delivering godlike perspectives of inaccessible spots, revolutionizing rescues around the globe, and offering a few of our most-watched television moments—including the cloud of newscopters that trailed O. J. Simpson’s Bronco—the helicopter is way extra able than early inventors anticipated. Now James Chiles profiles the various helicoptrians who contributed to the advance of this impressive computing device, and will pay tribute to the selfless heroism of pilots and crews. A digital flying lesson and medical event story, The God Machine is greater than the heritage of an invention; it's a trip into the minds of imaginitive thinkers and a desirable examine the methods they replaced our world.
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Extra resources for The God Machine: From Boomerangs to Black Hawks: The Story of the Helicopter
Example text
Liquids, on the other hand, are usually strong absorbers of radiation. Finally, heat transfer through a vacuum is by radiation only since conduction or convection requires the presence of a material medium. qxd 9/10/2002 8:30 AM Page 31 31 CHAPTER 1 EXAMPLE 1–10 Heat Loss from a Person Room air 20°C Consider a person standing in a breezy room at 20°C. 6 m2 and 29°C, respectively, and the convection heat transfer coefficient is 6 W/m2 · °C (Fig. 1–39). · Qconv 29°C · Qrad SOLUTION The total rate of heat transfer from a person by both convection and radiation to the surrounding air and surfaces at specified temperatures is to be determined.
040/h Discussion The heat loss from the heating ducts in the basement is costing the home owner 4 cents per hour. Assuming the heater operates 2000 hours during a heating season, the annual cost of this heat loss adds up to $80. Most of this money can be saved by insulating the heating ducts in the unheated areas. 2 psia 9 ft 70°F 50°F 40 ft 50 ft FIGURE 1–20 Schematic for Example 1–4. 2 psia (Fig. 1–20). Initially the house is at a uniform temperature of 50°F. Now the electric heater is turned on, and the heater runs until the air temperature in the house rises to an average value of 70°F.
4 W The person will also lose heat by radiation to the surrounding wall surfaces. We take the temperature of the surfaces of the walls, ceiling, and floor to be equal to the air temperature in this case for simplicity, but we recognize that this does not need to be the case. These surfaces may be at a higher or lower temperature than the average temperature of the room air, depending on the outdoor conditions and the structure of the walls.